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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4037a3a54afb4fedc2ee0cec354ec0392a2a610459dc0dead830d95d6e821d63' 
  AND token = 'kYNhBsSGIIBLWZodqQHZjE3BRlLzH0TgMoq5zv6UiaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}